DarkTable.java

package com.weblogism;

import com.github.weisj.darklaf.LafManager;
import com.github.weisj.darklaf.theme.DarculaTheme;
import javax.swing.*;
import javax.swing.table.*;
import java.awt.*;


public class DarkTable extends JFrame {

    static class DarkTableModel extends AbstractTableModel {

        int rows;
        int cols;
        
        public DarkTableModel(int rows, int cols) {
            this.rows = rows;
            this.cols = cols;
        }

        @Override
        public int getRowCount() {
            return rows;
        }

        @Override
        public int getColumnCount() {
            return cols;
        }

        @Override
        public Object getValueAt(int rowIndex, int columnIndex) {
            return "(" + rowIndex + ", " + columnIndex + ")";
        }
    }

    public DarkTable() {
        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        setTitle("Lorem Ipsum");
        
        try {
            setSize(new Dimension(400, 300));
            JPanel mainPanel = new JPanel();
            
            // This doesn't work:
            JTable aTable = new JTable();
            aTable.setModel(new DarkTableModel(10,10));
            
            // This works:
            // JTable aTable = new JTable(new DarkTableModel(10,10));
            
            aTable.setAutoResizeMode(JTable.AUTO_RESIZE_OFF);
            
            JScrollPane scrollPane = new JScrollPane(aTable);
            scrollPane.getViewport().setScrollMode(JViewport.BACKINGSTORE_SCROLL_MODE);
            scrollPane.setHorizontalScrollBarPolicy(ScrollPaneConstants.HORIZONTAL_SCROLLBAR_ALWAYS);
            
            mainPanel.setLayout(new BorderLayout());
            mainPanel.add(scrollPane, BorderLayout.CENTER);
            
            getContentPane().setLayout(new BorderLayout());
            getContentPane().add(mainPanel, BorderLayout.CENTER);
        } catch (Exception e) {
            e.printStackTrace();
        }
    }

    public static void main(String[] args) {
        SwingUtilities.invokeLater(() -> {
            LafManager.install(new DarculaTheme());
            final DarkTable frame = new DarkTable();
            frame.setVisible(true);
        });
    }
}